• Journal of Inorganic Materials
  • Vol. 35, Issue 8, 931 (2020)
Yuquan WEI1、2、3, Yong YANG1、2、*, Meng LIU1、2, Qile LI1、2, and Zhengren HUANG1、2、*
Author Affiliations
  • 1State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
  • 2Structural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
  • 3University of Chinese Academy of Sciences, Beijing 100049, China
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    DOI: 10.15541/jim20190595 Cite this Article
    Yuquan WEI, Yong YANG, Meng LIU, Qile LI, Zhengren HUANG. Effect of High Temperature Heat Treatment on Phase Composition and Microstructure of SiBCN/HfC Ceramic Composites[J]. Journal of Inorganic Materials, 2020, 35(8): 931 Copy Citation Text show less

    Abstract

    Amorphous SiBCN powders were prepared by high-energy ball milling-mechanical alloying method. The SiBCN/HfC ceramic composites were consolidated by spark plasma sintering (SPS). The influence of high temperature heat treatment on the microstructural evolution and phase composition was investigated. The results showed that the oxygen was introduced during the mechanical alloying process, leading to the oxidation of BN to form B2O3. HfO2 was formed in the sintering process result from HfC oxydation and reduced to HfB2 by carbothermal reduction reaction after heat-treatment at 1600 ℃ for 1 h. Both HfO2 and HfC were reduced to HfB2 during the heat-treatment at 1650 ℃ and 1800 ℃ by reaction of HfC + C + B2O3 → HfB2 + CO. Introduction of oxygen causes phase transformation of the SiBCN/HfC ceramic composites after heat treatment at high temperatures, during which ceramic matrix becomes loose and porous due to volatilization of the gaseous byproducts. Therefore, control of oxygen content is the key to the real applications of SiBCN/HfC ceramic composites at high temperatures.
    Yuquan WEI, Yong YANG, Meng LIU, Qile LI, Zhengren HUANG. Effect of High Temperature Heat Treatment on Phase Composition and Microstructure of SiBCN/HfC Ceramic Composites[J]. Journal of Inorganic Materials, 2020, 35(8): 931
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